package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service//缺了这个注释就会连不上
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {


    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;


    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {


        //如果当前菜品已经在，查表，查套餐或者菜品
        ShoppingCart shoppingCart = new ShoppingCart();//构建用于查询的ShoppingCart类型数据
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        Long userid = BaseContext.getCurrentId();//来自拦截器得到的JWT令牌，存在线程局部变量，获取微信用户的主键
        shoppingCart.setUserId(userid);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果购物车里有，那也只可能有一个
        if(list!=null&&list.size()>0){
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        }
        else
        {
            //如果当前菜品不在,先判断是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId!=null){//是菜

                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }
            else
            {
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());

            //加入购物车
            shoppingCartMapper.insert(shoppingCart);

        }

    }




    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {

        //获得微信用户Id
        Long userid = BaseContext.getCurrentId();

        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setId(userid);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        return list;
    }




    /**
     * 清空购物车
     */
    public void cleanshoppingCart() {

        //获得微信用户Id
        Long userid = BaseContext.getCurrentId();
        shoppingCartMapper.cleanShoppingCartById(userid);

    }




    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }

}
